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Word of the Day 11/19/18 Penumbra

Penumbra (noun)
penumbra [pi-nuhm-bruh]


noun, plural pe·num·brae [pi-nuhm-bree] /pɪˈnʌm bri/, pe·num·bras.
1. Astronomy.
a. the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off. Compare umbra(def 3a).
b. the grayish marginal portion of a sunspot. Compare umbra(def 3b).
2. a shadowy, indefinite, or marginal area.

Related forms
pe·num·bral , pe·num·brous , adjective

Related Words for penumbra
shadow, dark, gloom, obscurity, shade, darkness, dusk, screen, cover, shadiness, umbrage, blackness, coolness, penumbra, umbra, semidarkness, gloominess, adumbration, shelter, protection

See more synonyms on Thesaurus.com

Origin: 1660–70; < New Latin, equivalent to Latin paen- pen- + umbra shade

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